The bakery boss revealed she had been flirting for weeks with the fresh produce manager. She also said he had told her he had split from his 54-year-old partner before their romp in an office on Saturday.

The video went viral after being shared on WhatsApp.

"It was a spur-of-the-moment thing, a moment of total madness," she told The Sun. "I've paid a high price for a silly mistake. I suppose I managed to be the idiot that gets caught doing it.

"We had been flirting at work for a few weeks but it was nothing serious. I had just finished but he was still working when one thing led to another at about seven in the evening. It just seemed to happen out of nowhere.

"He made the first move, I went along with it and it just spiralled out of control. The whole world has seen what happened next. He's quite a bit older than me so maybe he should have known better but so should I.

Ms Kirby said she was “absolutely mortified”.

"The person I feel really awful for is Neville's partner. She must be mortified about it all. Neville had said that they'd separated."

The pair were spotted by a group of lads outside who then shared the video on WhatsApp. Ms Kirby was horrified to discover on Monday that it was doing the rounds at the store in Stalham, Norfolk, about 225km northeast of London.

"There was a rumour going around at work," she said. "At first I didn't know if it was true until at the end of my shift they showed it to me. I was absolutely mortified."

Management hauled in the pair and told them there would be an investigation. "By Tuesday morning the video had gone viral and there was nothing I could do about it," she said.

Neville Fox, 35, told her he had split from his partner.

"I handed in my notice. Can you imagine having to go in and face everyone after something like that? It's been a really mad week. I think I might move to Brazil to get away from it all.

"I had to delete all of my social media because of the comments. It went completely out of control. I had 304 friend requests on Facebook after it came out - mainly from teenage boys."

She apologised to Mr Fox's partner but said some of her own family were envious at all the attention she had been getting. And she said she had been compared to US TV star Kim Kardashian, who shot to fame after appearing in a sex tape.

She apologised to Tesco, where had she worked since 16.

"My older sister's really jealous," she said. "She says we're now the Kardashians of Norwich. She would definitely have preferred it if she had got fame out of this. She watched the video with me and said she would have expected me to be sitting on a chair."

Ms Kirby said her parents were also unhappy. "I've always been the good one so I think they were all a bit shocked," she said. "I got some of the best grades at school."

She also apologised to Tesco, where she had worked since leaving school at 16. "I've damaged the brand," she said. "It feels like a kick in the teeth to them."